Impression-making tool



A. J. SEILER IMPREsSoN MAKING TOOL Filed Dec. 21, 1925 llit Patented Feb. 9, 1926.

UNITED STATES ADAM J. SEILER, OF FREEPORT, ILLINOIS.

IIPRESBION-HAKING TOOL.

Application led December 21, 1923. Serial No. 681,975.

To all 'whom 'it may concern:

.Be it known that I, ADAM J. Smaak. a citizen of Germany, residing at Freeport, in the county of Stephenson and State of Illinois, have invented certain new and useful Improvements in Im resion-Making Tools, of which the following is a specification.

This invention relates to impression-making tools, such for example as a c enter punch or any other tool or device utilized for making an impression irrespective of its shape, in a hard bodv.

The primaiv object of my invention 1s to provide an improved means for making .fuch impressions, whereby the impressionmaking operation is facilitated and may be performed quickly and accurately.

Mote particularly, I have aimed to provide a tool or device embodying an impression-making member and means whereby an impression-makingimpract or blow will be imparted to such mem er by the act of pressing it against a -body to be marked or impressed.

In illustrating the principle of my invention. I have taken as an example its application to a hand center punch. In thiscase. the striking mechanism is self-contained within a suitable casing or body and the impression is made by a center point. The manner in which this is done will be described more articularlv herein after.

Another ob]eet is to provide an improved center punch, embodying the principle ot operation .above mentionedso constructed" as to be thoroughly practical and capable of being produced at a comparatively low cost.

Other objects and attendant advantages will be appreciated by those skilled in this art as the invention becomes better understood by reference to the following description wien considered in connection with the accompanying drawing, in which- Figure l is a side elevation of an 1mpression-'making tool embodying my 1nventicn, the particular tool being a center punch;

Fig. 2 is a longitudinal sectional view through the tool in its normal position;

Figs. 3 and 4 are similar sectional views showing the tool in successive stages o1 operation; and

Fig. 5 is a cross-sectional view taken on the line 5-5 of Fig. 2.

As mentioned above, my invention is in the present instance applied to an impression-making tool of the kind known as a center punch, such as is used by artisans for making center marks or impressions and particularly by machinists and tool-makers for making center marks in metal. While a tool of this kind may be made in any suitable size, that shown in the-drawing` is for purpose of clarity nearly twice Athe size of a hand center punch such as would' be suitable for ordinary use. A

The body or casing in this exa'ii'iple, is

formed of two sections threadingly connec-ted together, which I have termed a point-casing section and a handle-casing section designated generally by 7 and 8 respectively. An impression-ma ing member or carrier 9 slidable axially in the casing seetion 7 extends from the latter and has an impression-making point l1 on its extended end. I prefer to make the impression-making part per se detachable from the member 9. so that different impression-making parts may be substituted therefor without dislasembling the tool. As shown, the impession-making part 12 has a shank 13 held by a friction fit in the member 9 and reaching into a recess 14 therein, whereby said shank may be engaged by a tool for extracting the part 12. A compresion spring 15 on the member 9 acting between a collar 16 .si-rewed into the casing section 7 and a shoulder 17 on said member, constantly' uges the latter to an extended position limfited by contact ot its shouldered portion against the casing Section 7.

It will be manifest that the casing or body may be pressed upon, telescoping it over the member .9, the inner end of which moves lengthwise within the body. This relative movement of the member 9 within the body is utilized for moving a striking plunger designated generally by 18, lengthwise within the body against the pressure ot' a main spring 19 interposed between said plunger and the upper end of the body, to thereby store up pressure in said spring 19 to be subsequently released for imparting an impression-making impact or blow to the memer 9. Tol this end, a releasable connection is established between the point-carrier or impression-making member 9 and the plunger 18 by means of a trigger 21, which is carried in and moves transversely of the plunger. A small compression spring 22 interposed between the plunger and trigger constantly urges the latter to the right, viewing Fig. 2, so as to position its shoulder 23 in the path of a shoulder 24 on the adjacent end of the member 9, whereby to arrest upward movement of the latter with respect to the plunger and to canse both principal parts to move in unison within the body when the latter is thrust forwardly b v external pressure against thepoint as above described. B v continuing such external pressure on the lusing. the main spring 19 will be compressed, thereby storing up considerable pressure. 'At a predetermined point the trigger 21 will be released or actuated so as to dis onnect the shoulders 23 and 21. In the present instance, the trigger is so actuated by striking against an internal face 25 in the handle-casing section.A

It will now be observed that both the plunger and the trigger are bored for the reception ot the upper end ot' the memberl t) so that when the plunger andv said member are disconnected by the trigger' action just described the plunger will be telescoped over saidvmember in a rapid. forceful stroke under the. influence. ot' the stored-up pressure in the lnain spring 19. vequipped :with a striking point 26 which strikes against the end 2T of the member t) as shown in Fig. 4, thereby delivering a blow or impact to the latter with sufficient'. force to make a satisfactoryv point impression in the body or work-piece indicated at presentby 28, The striking point 26 is adjustable axiallywith. respect to the plunger 18 so that the distance between said striking point and the end 2T ot' the point-carrier may be lengthened or shortened, and coi'isequently Varied `I with respect to the time at, which the trigger' is actuated. 'By varying this distance the force ot' the impact may be made greater or less 'for making a deeper or shallower impression, according tothe shape of the impression point and to the nature of the work at handI This adjustment is accomplished at present by making the striking point 26' integral with a screw 29 threadingly engaged n in the. plunger 18. The screw 1s accessiblet'or adjustment by separating the casing` sections and removing the plunger. y

From the foregoing, it will be manifest that my improved impression-making tool may be operated by simply locating the point 11 on a body, such as 28, and pressing downwardly on the handle casing. This external pressure will cause the part/s to move The plunger isfrom the Iposition shown in Fig. 2 to that is actuated as above'described, such storedf up pressure. will be released and the plunger will be instantly driven in the impressionniaking stroke. Incidentally it will be noted that the external or hand pressure must be` applied or continued until after the impression`making impact in order to provide the necessary resistance thereto. When this external pressure is released, the parts will be returned to the normal position shown in Fig. :2, the .spring 15 functioning to extend the member f) as above describeth lt. is believed that the foregoing conveys a clear under.-;taiuling of the objects prefaced above, and while I have illustrated but. a single working embodiment, it should be understood that considerable change ymight be made in details oil' construction without departing from the spirit and scope ot' the invention as expressed in the appended claini` in which- I claim:

An impression making tool ot' the character described comprising a body composed ot a front tool-holding section` and a rear handle Isection havinga smooth rear end to be borne against b v the hand in the use of the tool. a tool element reciln'oable in the front section and having an anvil end inside said body, a plunger element reciprocable 1n the rear handle section, a compression spring betweenv it and the rear end ot said handle section arranged to be loaded when the rear end of said handle section is borne against in the direction of the tool element while the latter is engaging tliewoik to deliver a blow of pre-determined force to said tool element, a trigger for releasing said plunger element for a blow on said tool element at a preA determined degree of compression' ot' said spring, and a hammer member adjustable .said plunger element and having a screwdriver slot in,v the rear end thereof exposed for engagement and adjustment by a screwdriver at the rear end of said, plunger element.

ADAM J. sEiLER. 

